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Battery Drain

The owners manual suggest watching this You Tube Clip:


The clip refers to the entry in the manual under:

High Voltage Battery Information

The Battery can discharge at a rate of approximately 1% per day, though the discharge rate may vary depending on environmental factors (such as cold weather), vehicle configuration, and your selected settings on the touchscreen. Situations can arise in which you must leave Model 3 unplugged for an extended period of time (for example, at an airport when travelling). In these situations, keep the 1% in mind to ensure that you leave the Battery with a sufficient charge level. For example, over a two week period (14 days), the Battery may discharge by approximately 14%.


The guy doing the YouTube clip suggest he got a better result than 1% a day. I have measured the loss in my car over the past 2 months. I have measured miles lost rather than Kwh. Because of personal circumstances I have not been doing a lot of driving miles. In May and June I took note of the miles I put in on charging and the miles I drove and over both months I lost 40% of the miles I put in i.e. I am getting 60 miles on the road for every 100 miles I put in the tank.

Reading the para from the Tesla manual which talks about 1% a day and 14% over 14 days then that would equate to a loss of 30% over 30 days (yes / no?). But I have driven an average of 300 miles in each of those months, does that affect the amount of drain or is it still 1% a day AND should I be complaining that I am losing 1.3% a day?
 

Jason71

Active Member
May 8, 2019
4,486
5,027
Shropshire
I think this has been pointed out before but you are mixing too many different things here to get a meaningful answer.
you cannot conflate a difference between miles covered vs estimated with phantom drain they are not the same thing. That difference is partly down to the estimate being based on EPA range estimates and you not driving as they do in an EPA test.

If you really want to do a phanton drain test
park the car (sentry off) . leave it to cool. check the battery % ( not the miles the %) leave the car for a long period. ideally 24 hours. Do not use the app. Check the % when the ambient temp is the same as when you started the test.
That will give you a true measure of phantom drain
mine is between 0.5% and 1% I would say.
 

GeorgeSymonds

Active Member
Moderator
Mar 16, 2018
2,292
2,439
UK
Loss is largely typically linked to whether the car sleeps or not. A number of things can stop it, sentry mode, overheat protection, downloading a map or software update, uploading data for some reason.

So depending on what your car is doing and what setting you have set that could be good or bad. It doesn’t seem particularly unusual.

As an aside, I very much doubt the user manual suggests watching any 3rd party video
 
Apropos of nothing but I am completely and utterly done with YouTube thumbnails like that. I know it apparently works best for algorithms, but I don't care, it's grating.
100% with you on that. Even if it's someone I watch regularly, if there's any whiff of a clickbait thumbnail and/or description, the content stays unwatched.
 
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Here are some Teslamate numbers. If allowed to go onto standby/sleep the car looses only as few miles of range over the course of as week. Things that have a negative impact are sentry mode, cabin overheat protection, waking the car up via the app, 3rd party apps waking the car up, Intelligent Octopus not letting it sleep firmware updates and the big one for me is going out to the car to get something from it.
Screenshot_20220706-140421_Edge.jpg
 

MrT3

Active Member
Jun 26, 2021
1,655
1,091
UK
Software updates that occured a number of months ago significantly reduced drain when leaving your vehicle unattended. Before it was very common for vehicles to wake up every 24 hours for nearly an hour and waste 0.5% every day until it noticed you weren’t using the vehicle for several days and stopped.

Now you can leave your vehicle for 6+ days without it waking up once, and only lose 0.5 to 1.0% for the whole time.
 

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